Feinting sound record



Jan. 5, 1937. HEYMER I 2,066,728

PRINTING SOUND RECORD Filed March 27, 1954 Patented 10.21. 5, 1937 I l I 4 Q UNITED STATES PATENT OFFICE,

PRINTING SOUND RECORD Gerd Heymer, Woli'en Kreis Bltterfeld, Germany,

assignor to I. G. Faybenindustrie Aktiengesellschaft, Franklort-on-the-Main, Germany Application March 27, 1934, Serial No. 717,671

In Germany March 29, 1833 4 Claims. (Cl. 95-75) My present invention relates to printing sound The films may be spaced apart, however, up to records and more particularly to printing sound several times the thickness of a film, but the records on lenticular film. quality of reproduction of the sounds decreases One of its objects is an improved process for with increasing distance of the films from each. printing a sound record of the variable density other. 5

type on lenticular film. Another -object is an Thus a sound record may be printed optically arrangement for printing according to my process. on a lenticular film illuminated through the em- Further objects will be seen from the detailed bossed side, and an unobjectionable reproduction specification following hereafter. .of the sound track obtained, if a slot-shaped Reference is made to the accompanying drawsource of light is used.

ing in which In Fig. 1 of the accompanying drawing an ar- Fig. 1 shows an arrangement for printing acrangement of the films and the source of light cording to this invention, according to the invention is represented by way Fig. 2 shows the trace of the rays from the of example: source of light through the lenticulations of the' The lenticular positive film LP is arranged so film when printing according to this invention, that its embossed side. is in contact with the and originally light-sensitive layer of the negative Fig. 3 shows diagrammatically anapparatus film N carrying the sound record TN, which is of for printing according to this invention. the variable density type. The lcnticular ele- In printing a. lenticular picture film it is neces-- ments of the printing film extend perpendicularly sary to expose the film through the embossed side to the steps of the sound track. For the exposure thereof. If a sound track is to be printed on a there is used the slot-shaped source of light L, lenticular film with the embossed side of the latter which extends parallel with the steps of the g in contact with the negative, difiiculties are en-- sound track TN. '1? represents the print of the 5 countered in that, due to the distance between sound track.

the sound negative and the sensitized layer on Fig. 2 shows the trace of the rays when printing the lenticular film the copy of the print proaccording to this invention. A'Bis the line shaped duced on the printing film is not sharp. To oversource of light, for instance, a wire of an incancome these difiiculties it has been proposed to descent lamp. By each of the lenticular elements print the sound record separately from the pica real image of AB is printed in the light senslture record, byarranglng the sensitized layer on tive layer S. These images may be larger or narthe lenticular film in contact with the originally rower than the breadth of the lenticular elesensitized layer of the negative film. ments. Fig. 2 shows the case in which the im- According to this invention a sharp print of 9. ages A'B' of AB projected by two adjacent lensound track of the varying density type-is proticularelements are just juxtaposed. This con duced on the lenticular printing film when printdition is realized when ing through the embossed side, by using for the' f F exposure a slot-shaped source of light which ex- :11. tends parallel to the steps of the sound track. In direction of the sound track the extension of the I be ng he thickness of e fi d the breadth 0 source of light is as small as possible. Preferof the lenticularelements, 11. the index of refracably there is used a one-wire lamp which extends t F t e di e of the 50111118 of light parallel to the steps of the sound track. and D the breadth of the source of light AB.

The source of light may be arranged at any Fig- 3 S w diagrammatically an apparatus distance from the negative film, but the breadth for printing according to this invention i5 of the source or light is advantageously so chosen the lamp house in which there is arranged the with respect to its position that the image of the linolite lamp S of which the incandescent wire source projected by one lenticular element of the is seen in section. The light slit M is parallel printing filter has just the breadth of one lentlcuto the incandescent wire of the linolite lamp. lar element, so that under the lenticular ele- The films are fed from the rolls A and C to the ments, a uniform image of the source or light is rolls B and D continuously by means of the obtained which is not interrupted by dark spots. sprocket. drum '1', While printing, the lenticular film is preferably whatI claim is: arranged with its embossed' side in contact with l. A process of printing a sound record of the the originally sensitized layer of the negative film. variable density type, provided on a smooth film,

onto a lenticular film which comprises arranging a lenticular printing film so that its lenticular elements face the emulsion layer of said smooth sound film and extend perpendicularly to the steps of said sound record, projecting a slotshaped source of light extending parallel with the steps of the sound record through said sound record onto said lenticular film, the breadth of the source of light and its distance from the films being such that the image of the source of light projected by each lenticulation oi the printing film covers the breadth of said lenticular eiement, thus producing a uniform image which is not interrupted by dark spots.

2. An arrangement for printing a sound record of the variable density type, provided on a smooth film, onto a lenticular film which comprises in combination a smooth sound film bearing a sound record of the variable density type, a lenticular printing film with the lenticular elements facing the emulsion layer of said sound film and extending perpendicularly to the steps of said sound record, a slot-shaped source of light arranged parallel with the steps of said sound record on the side of the sound record thus illuminating said sound record with as little extension as possible in the direction of the sound record, the breadth of the source of light and its distance from the films being such that the image of the source of light projected by each lenticulation of the printing film covers the breadth of said lenticular element, thus producing a uniform image which is not interrupted by dark spots, and means for producing a sharp image of said illuminated part of said sound record in the emulsion layer of said lenticular film.

3. An arrangement for printing a sound record of the variable density type, provided on a smooth film, onto a lenticular film which comprises in combination a smooth sound film bearing a sound record of the variable density type, a lenticular printing film having its lenticular elements In contact with the emulsion layer of said sound film and extending perpendicularly to the steps of said sound record, and a slot-shaped source of light arranged on the side of the sound film extending parallel with the direction of the steps of said sound record, the breadth of the source of light and its distance from the films being such that the image of the source of light projected by each lenticulation of the printing film covers the breadth of said lenticular element, thus producing a uniform image which is not interrupted by dark spots.

4. An arrangement for printing a sound record of the variable density type, provided on a smooth.

film, onto a lenticular film which comprises in combination a smooth sound film bearing a sound record of the variable density type, a lenticular printing film with its lenticular elements facing the emulsion layer of said sound film and extending perpendicularly to the steps of said sound record, a slot-shaped source of light arranged on the side of the sound film and extending parallel with the steps of said sound record thus illuminating said sound film with as little extension as possible in the direction of the sound record, the breadth of the source of light and its distance from the films being such that the image of the source of light projected by each lenticulation of the printing film covers the breadth of said lenticular element, thus producing a uniform image which is not interrupted by dark spots; and an optical system between said lenticular film and said sound film for producing a sharp image of said illuminated part of said sound film in the emulsion layer of said lenticular film.

GERD HE'YMER. 

